Stora Vidarvatn, Iceland 2,000 Year Chironomid and Geochemical Data Axford, Y.; Geirsdóttir, A.; Miller, G.H.; Langdon, P.G. Axford, Y. Geirsdóttir, A. Miller, G.H. Langdon, P.G. Air Temperature Reconstruction Little Ice Age (LIA) PAGES 2k Network PAGES Arctic 2k earth science/paleoclimate/paleolimnology (carbon,sediment,null,weight percent,null,paleolimnology,null,elemental analysis,N,null) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Chironomus anthracinus type) earth science/paleoclimate/climate reconstructions|insect|paleolimnology (depth,null,null,centimeter,null,climate reconstructions|insect|paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (mineral matter,sediment,null,weight percent,null,paleolimnology,null,null,N,calculated as residual of %C/0.4+%Bsi) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Corynoneura scutellata) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Heterotrissocladius sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Psectrocladius sordidellus) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Thienemanniella sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Micropsectra sp.) earth science/paleoclimate/insect|paleolimnology (detrended correspondence analysis axis,null,null,dimensionless,null,insect|paleolimnology,null,null,N,DCA axis 1 of chironomid assemblage) earth science/paleoclimate/paleolimnology (biogenic silica,sediment,null,percent,null,paleolimnology,null,spectrophotometry,N,method of Mortlock and Froelich 1989 with 10% Na2CO3) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Procladius sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Cricotopus sp. 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Type A) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Chironomini larvula) earth science/paleoclimate/paleolimnology (nitrogen,sediment,null,weight percent,null,paleolimnology,null,elemental analysis,N,null) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Diamesa sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Cricotopus sp. type P) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Cricotopus sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Orthocladiinae) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Tanytarsus lugens type) earth science/paleoclimate/climate reconstructions|insect|paleolimnology (temperature,midge assemblage,null,degree Celsius,Aug,climate reconstructions|insect|paleolimnology,null,regression analysis,N,linear regression) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Metriocnemus fuscipes) earth science/paleoclimate/paleolimnology (Stora Vidarvatn>LATITUDE 66.2372>LONGITUDE -15.8347) A sedimentary record from lake Stora Vidarvatn in northeast Iceland records environmental changes over the past 2000 years. Downcore data include chironomid (Diptera: Chironomidae) assemblage data and total organic carbon, nitrogen, and biogenic silica content. Sample scores from detrended correspondence analysis (DCA) of chironomid assemblage data are well correlated with measured temperatures at Stykkisholmur over the 170 year instrumental record, indicating that chironomid assemblages at Stora Vidarvatn have responded sensitively to past temperature changes. DCA scores appear to be useful for quantitatively inferring past temperatures at this site. In contrast, a quantitative chironomid-temperature transfer function developed for northwestern Iceland does a relatively poor job of reconstructing temperature shifts, possibly due to the lake's large size and depth relative to the calibration sites or to the limited resolution of the subfossil taxonomy. The pre-instrumental climate history inferred from chironomids and other paleolimnological proxies is supported by prior inferences from historical documents, glacier reconstructions, and paleoceanographic studies. Much of the first millennium AD was relatively warm, with temperatures comparable to warm decades of the twentieth century. Temperatures during parts of the tenth and eleventh centuries AD may have been comparably warm. Biogenic silica concentrations declined, carbon:nitrogen ratios increased, and some chironomid taxa disappeared from the lake between the thirteenth and nineteenth centuries, recording the decline of temperatures into the Little Ice Age, increasing soil erosion, and declining lake productivity. All the proxy reconstructions indicate that the most severe Little Ice Age conditions occurred during the eighteenth and nineteenth centuries, a period historically associated with maximum sea-ice and glacier extent around Iceland. STUDY NOTES: Chironomids and other lake sediment proxies from Stora Vidarvatn, Iceland, and DCA-inferred Raufarhofn August temperature. Core 05-SVID-SC was obtained from 20.6 m water depth in summer 2005. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Axford, Y. Investigator : Geirsdóttir, A. Investigator : Miller, G.H. Investigator : Langdon, P.G. 2008-11-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/6191 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/stora-vidarvatn2008.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/stora-vidarvatn2008.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/stora-vidarvatn2008.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/stora-vidarvatn2008.txt English https://www.ncdc.noaa.gov/paleo/study/6191 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/stora-vidarvatn2008.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/stora-vidarvatn2008.txt Yarrow Axford, Aslaug Geirsdottir, Gifford H. Miller, Peter G. Langdon 2009Climate of the Little Ice Age and the past 2000 years in northeast Iceland inferred from chironomids and other lake sediment proxiesJournal of Paleolimnology4117-2410.1007/s10933-008-9251-1http://springer.libdl.ir/article/10.1007/s10933-008-9251-1 START YEAR: 1843 cal yr BP * END YEAR: -57 cal yr BP -15.8347 66.2372 -15.8347 66.2372